If your neighbor is doing the same thing, or the right cards arent flowing, then Boros wont work out, and it can be difficult to move from Boros into a different strategy
These cards help you get a little extra mileage out of your stuff, or just get you stuff when you need it
[-10]: You gain 7 life, draw seven cards, then put up to seven permanent cards from your hand onto the battlefield
Cyclopean Snare just taps a creature, both Puppet Strings and Icy Manipulators have better taps for less than 3 mana (one can untap creatures, the other can tap down non-creatures as well)
This two-mana instant gives all creatures hexproof and indestructible until the end of the turn to save them, just like Heroic Intervention
For a measly one blue mana, you get to dip into your deck and pull out any sorcery ready to go off the top of your deck